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to insert
to interrupt; to slip in a word
to harbor (e.g. doubts); to harbour; to entertain (e.g. a theory)
「挟む」 has another reading with different meanings.
箸で豆腐を上手に挟むのは難しい。
It's hard to pick up tofu well with chopsticks.
彼は腕を組んで本を脇に挟んでいた。
He had his arms crossed with a book under his arm.
二つの国に挟まれた小さな国がある。
There is a small country sandwiched between two countries.