σφίγγω

Etymology
According to Beekes, perhaps of origin.

Verb

 * 1) to bind tight, tie fast
 * 2) to bind or hold together
 * 3) to tie up in a bundle
 * 4) to tighten up
 * 5) to press together
 * 1) to press together

Etymology
From.

Verb

 * 1) to squeeze, tighten
 * 2) to tie (e.g. shoelaces)
 * 3) to thicken (e.g. a sauce)
 * 4)  to behave in a constrained, cautious manner