to  keep  in (good) trim
keep
ki:p
kip
in
ɪn
in
(good)
gʊd
good
trim
trɪm
trim

Definition & Meaning of "keep in (good) trim"in English

to keep in (good) trim
01

to remain healthy and in good physical shape 

Dialectbritish flagBritish
to [keep] in (good|) trim definition and meaning
Idiom
Informal

What is the origin of the idiom "keep in trim" and when to use it?

The idiom "keep in trim" originated in the early 20th century and is believed to have been derived from the nautical term "trim," which refers to maintaining a balanced position of a ship in the water. It has since been used metaphorically to describe the act of keeping oneself or something in good condition, often in terms of physical fitness or maintenance.

Examples
He exercises every morning to keep in trim. 
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