bug
US /bʌɡ/
UK /bʌɡ/

1.
a small insect
:
•
There's a little bug crawling on the wall.
•
I found a strange bug in my garden.
2.
a hidden listening device; a miniature microphone
:
•
The police found a bug planted in his office.
•
They suspected there was a bug in the room.
3.
1.