/ ˈsɪnjuː; NAmE / noun
1.
[ C , U ] a strong band of tissue in the body that joins a muscle to a bone
2.
[ usually pl. ] ( literary ) a source of strength or power
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IDIOMS
see strain verb
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WORD ORIGIN
Old English sin(e)we tendon , of Germanic origin; related to Dutch zeen and German Sehne .