bidding / bitting [ˈbɪdɪŋ]
bidding – pres. part. of bid – 1. offering a certain price, esp. at an auction; 2. commanding, ordering; 3. inviting, greeting or farewells
bitting – pres. part. of bit – 1. put a bit into the mouth of (a horse, ect.); 2. restrain; 3. the shape of the bit of a key that causes it to fit or actuate the lock.