看家 (kān jiā) is a separable verb (离合词) that literally means 'to guard/watch over the house'. It has two major extended uses: (1) in the fixed phrase 看家本领 (kān jiā běn lǐng), it means 'one's special skill or forte' — the ability you can always rely on; (2) as a modifier in compounds like 看家狗 (guard dog) or 看家货 (goods saved for emergencies). When used as a verb, you can split it to insert a duration or aspect: 看了三天家 (watched the house for three days). The pronunciation is kān (first tone), not kàn.