1 C1 neutral
(Programming) For a compiler to automatically remove code that it determines has no effect on the program's output.
"The variable was never used, so the compiler optimized it out during the build."
separable
optimize out
C1 neutral separable transitive
In programming, to have a compiler or optimiser automatically remove code that is unnecessary or has no effect on the output.
In plain English
When a computer compiler removes code that it figures out is useless or pointless.
What does "optimize out" mean?
2 meanings, ordered from most common to least. Color-coded by CEFR level.
2 C1 neutral
(Programming) For a debugging or security mechanism to be unexpectedly removed by optimisation, causing problems.
"The security check was optimized out by the aggressive compiler settings, leaving a vulnerability."
separable
Literal vs figurative
Words literally mean
To optimise (make more efficient) something by taking it out (removing it).
Actually means
When a computer compiler removes code that it figures out is useless or pointless.
Usage tip
Primarily technical computing/programming jargon. Used in discussions of compiler behaviour, performance tuning, and code debugging. Rarely used outside software development contexts.
Words that pair with "optimize out"
Natural word combinations native speakers use most often.
compiler code variable loop branch instruction dead code
How to conjugate "optimize out"
The five tense forms you'll use most often.
Base
optimize out
I/you/we/they
3rd person
optimizes out
he/she/it
Past simple
optimized out
yesterday
Past participle
optimized out
have + pp
-ing form
optimizing out
continuous
Hear "optimize out" in the wild
Listen to native speakers using "optimize out" in real YouTube videos — click a clip to watch it on Looplines.
Keep exploring
Jump to every phrasal verb built on the same verb, particle, or level.