1. burn in - Noun
2. burn in - Verb
To eat into, as fire.
(transitive) To fix and render durable, as colours, by means of intense heat.
(figuratively) To imprint indelibly on the mind.
(transitive) To exercise electrical components by means of burn-in.
(manufacturing) The process by which components of a system are exercised prior to being placed in service (and sometimes before assembly), forcing certain failures to occur under supervised conditions.
The phase preceding a burn-out in which a worker's productivity and engagement with their work declines.
Source: en.wiktionary.orgburn-in
A mother's prayer does not sink in water, nor does it burn in fire. Lawrence of Chernigov
Anybody who recognizes Israel will burn in the fire of the Islamic nation's fury. Mahmoud Ahmadinejad
You have never loved me as I love you--never--never! Yours is not a passionate heart--your heart does not burn in a flame! You are, upon the whole, a sort of fay, or sprite-- not a woman! Thomas Hardy
I leave you, hoping that the lamp of liberty will burn in your bosoms until there shall no longer be a doubt that all men are created free and equal. Abraham Lincoln
You won't burn in hell. But be nice anyway. Ricky Gervais
Fire does not burn in a jar. Japanese Proverb