plural of professional foul

(idiomatic) Be quiet and discreet.

An intentionally furtive position as to not arouse suspicion or catch attention.

Misspelling of low-profile.

(education) An entry-level position in a university faculty, lower than an associate professor and a full professor.

Not clearly attracting attention; inconspicuous.

plural of professional student

(derogatory, US) Someone who takes college classes to avoid having to assume adult responsibilities after graduating from high school.

A person or group that gains a significant amount of revenue from selling weapons and military equipment.

plural of profaneness