in passing Definition

passing
adj

1. Lasting only briefly.

Thesaurus: temporary, fleeting, transitory, transient, momentary, brief, fugitive, short-lived; Antonym: permanent, long-lasting.
2. Casual; transitory.

Example: a passing glance
Example: a passing reference to her absence

noun

1. A place where one may pass.
2. A coming to the end.

Thesaurus: death, demise, end, termination, expiration, loss.
3. euphemistic
Death.

Idiom: in passing

While dealing with something else; casually; by allusion rather than directly.
Example: mentioned the accident in passing

Etymology: 14c: present participle of pass.