The police officer suspected criminal activity in the area.
ulterior motives
Frequency:
50
%
He suspected she had ulterior motives for helping him.
foul odor
Frequency:
45
%
She suspected a foul odor coming from the kitchen.
Idiomatic Expressions for suspecting
Phrase: suspecting a hidden agenda
Meaning: to believe that someone has a secret motive or plan
Usage: She was suspecting a hidden agenda behind his sudden interest in helping her.