אַף 'ap

1. "nostril, anger" Hebrew more than English describes emotion through the associated physical effects, flared nostrils lead to one word for "nostril" and for "anger" - it is the common word for "anger". In Amos it has both meanings, at 1:11 "anger" while at 4:10 "nostrils" as the organ of smell.
2. "indeed" conjunction indicating some kind of addition "indeed, though, moreover, yet" etc. In Amos at 2:11 "indeed".