To Put Between, To Sandwich, To Insert
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means between, so the verb version is to put between or to sandwich.
はさむ
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading already so you should be able to read it!
パンにハムと卵を挟みました。
I put the egg and ham between the bread.