verb
/ˈsweɚ/ swears; swore /ˈswoɚ/; sworn /ˈswoɚn/; swearing
to state (something) very strongly and sincerely [+ obj]
to promise very strongly and sincerely to do or not do something [+ obj]
[no obj] :to use offensive words when you speak
to make a formal or official promise especially in a court of law [+ obj]
[+ obj] :to cause (someone) to make a promise
I swear
informal - used for emphasis
swear by
[phrasal verb]
swear by (something) :to have or express a lot of confidence in (something) :to say that (something) is very good or useful
swear in
[phrasal verb]
swear (someone) in or swear in (someone) :to place (someone) in a new office or position by having an official ceremony in which that person makes a formal promise to do the work properly, to be honest and loyal, etc.
swear off
[phrasal verb]
swear off (something) chiefly US :to stop doing, having, or being involved in (something)
noun
plural swears
[count] US informal :swearword