to hold between (e.g. one's fingers, chopsticks); to grip (from both sides); to put between; to sandwich between; to catch (e.g. a finger in a door); to trap; to insert (e.g. a break into proceedings)
being stuck between a rock and a hard place; being in a dilemma; being torn between conflicting demands
attack on both sides; pincer movement; double envelopment
to insert; to interrupt; to slip in a word; to harbor (e.g. doubts); to harbour