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2 CONVENTION In Britain, people write ' Yours sincerely ' before their signature at the end of a formal letter when they have addressed it to someone by name. In the United States, people usually write ' Sincerely yours ' or ' Sincerely ' instead. □  Yours sincerely, James Brown.

si|necure /s I n I kjʊə ^r , sa I n-/ (sinecures ) N‑COUNT A sinecure is a job for which you receive payment but which does not involve much work or responsibility. □  She found him an exalted sinecure as a Fellow of the Library of Congress.

sine qua non /s I ni kwɑː noʊ n, [AM ] - nɑː n/ N‑SING A sine qua non is something that is essential if you want to achieve a particular thing. [FORMAL ] □ [+ of ] Successful agricultural reform is also a sine qua non of Mexico's modernisation.

sin|ew /s I njuː/ (sinews ) N‑COUNT A sinew is a cord in your body that connects a muscle to a bone. □ [+ of ] …the sinews of the neck.

sin|ewy /s I njuːi/ ADJ Someone who is sinewy has a lean body with strong muscles. □  A short, sinewy young man.

sin|ful /s I nfʊl/ ADJ If you describe someone or something as sinful , you mean that they are wicked or immoral. □  'I am a sinful man,' he said. ●  sin|ful|ness N‑UNCOUNT □ [+ of ] …the sinfulness of apartheid.

sing ◆◆◇ /s I ŋ/ (sings , singing , sang , sung )

1 VERB When you sing , you make musical sounds with your voice, usually producing words that fit a tune. □ [V ] I can't sing. □ [V + about ] I sing about love most of the time. □ [V n] They were all singing the same song. □ [V n n] Go on, then, sing us a song! □ [V with quote] 'You're getting to be a habit with me,' sang Eddie.

2 VERB When birds or insects sing , they make pleasant high-pitched sounds. □ [V ] Birds were already singing in the garden.

3 → see also singing

▸  sing along

1 PHRASAL VERB If you sing along with a piece of music, you sing it while you are listening to someone else perform it. □ [V P + with ] We listen to children's shows on the radio, and my little girl can sing along with all the tunes. □ [V P + to ] You can sing along to your favourite Elvis hits. □ [V P ] …fifteen hundred people all singing along and dancing.

2 → see also singalong

sing.Sing. is a written abbreviation for singular .

sing|along /s I nəlɒŋ, [AM ] -lɔːŋ/ (singalongs ) also sing-along N‑COUNT A singalong is an occasion when a group of people sing songs together for pleasure. □  How about a nice sing-along around the piano?

Sin|ga|po|rean /s I ŋgəpɔː riən/ (Singaporeans )

1 ADJ Singaporean means belonging or relating to Singapore, or to its people or culture.

2 N‑COUNT A Singaporean is a person who comes from Singapore.

singe /s I ndʒ/ (singes , singeing , singed ) VERB If you singe something or if it singes , it burns very slightly and changes colour but does not catch fire. □ [V n] The electric fire had begun to singe the bottoms of his trousers. □ [V ] Toast the dried chillies in a hot pan until they start to singe.

sing|er ◆◇◇ /s I ŋə ^r / (singers ) N‑COUNT A singer is a person who sings, especially as a job. □  My mother was a singer in a dance band. □  She was one of the great opera singers of the century.

si nger-so ngwriter (singer-songwriters ) N‑COUNT A singer-songwriter is someone who writes and performs their own songs, especially popular songs. □  Twenty years ago this singer-songwriter released his first album.