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peter out

B2 neutral intransitive
In simple words

To slowly get smaller and smaller until there is nothing left.

Meanings

1 B2 idiomatic neutral

For something to gradually diminish and come to an end, especially a path, flow, or supply.

"The dirt track petered out at the edge of the forest, leaving us with no clear route."

2 B2 idiomatic neutral

For enthusiasm, energy, or interest to gradually fade until it stops.

"Our motivation to redecorate the house petered out after we finished just two rooms."

3 B2 idiomatic neutral

For a conversation, movement, or activity to gradually lose momentum and stop.

"The protest movement petered out when its key leaders left the city."

Usage notes

Always intransitive. The origin of 'peter' in this phrase is uncertain, possibly from French 'péter' (to break wind) or from mining slang. Used for physical things (paths, rivers), abstract things (enthusiasm, hope), and events (conversations, movements). Common in both British and American English.

Commonly used with

enthusiasm trail conversation movement energy hope

Forms

Base
peter out
I/you/we/they
3rd person
peters out
he/she/it
Past simple
petered out
yesterday
Past participle
petered out
have + pp
-ing form
petering out
continuous

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