brains; mind; head; way of thinking

to be a real headache; to find sth a real headache; to beat one's brains

muscle; tendon; veins visible under the skin; sth resembling tendons or veins (e.g. fiber in a vegetable)

steel reinforcing bar

to use one's brains; to think

penis (Chinese medicine)

flexor tendon (coll.); tesuji (a skillful move in the game of Go) (orthographic borrowing from Japanese 手筋 "tesuji")

stretching (exercise)

rubber band

muscle cramp

rebar (construction)

veins; blue veins

gluten

stubborn; inflexible; one-track minded

(coll.) dim-witted; foolish; absent-minded

rubber band

(coll.) rubber band

to play rubber band jump rope

tropical milkweed (Asclepias curassavica)

idiot; porridge head