samentrekken (ww):
zusammenziehen(nl) —., Muskeln(en) to tighten one's muscles., beugen(en) to tighten one's muscles., biegen(en) to tighten one's muscles., lassen(en) to tighten one's muscles., spielen(en) to tighten one's muscles., zusammenzucken(en) to flinch as if in pain.
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Via: Memodata.com