- 1to try to understand or succeed in understanding something mysterious synonym fathom
- 2 She spent her life plumbing the mysteries of the human psyche. He had clearly plumbed the general sense of the message. Idioms
NAmE//plʌm//plumb something(literary)Verb Forms present simple I / you / we / they plumb
he / she / it plumbs
past simple plumbed
-ing form plumbing
to be or to experience an extreme example of something unpleasant His latest novel plumbs the depths of horror and violence. It was at that stage in her life when she plumbed the depths of despair. The team's poor performances plumbed new depths last night when they lost 10–2.
plumb the depths of somethingjump to other results