ob- (Latin: prefix; before c, ob- becomes oc- ; before f, ob- becomes of- ; before g, ob- becomes og-; before p, ob- becomes op- ; before m, ob- becomes o-)

toward, to, before:

oblige:

obsequious:

obstetrics:

obverse:

obvert:

against:

obdurate:

obfuscate:

object:

objection:

obloquy:

obnoxious:

obscure:

obsesse:

obstacle:

obstruct:

oppose:

opposition:

oppress:

oppression:

oppressive:

across, over, upon (in the way):

down:

occasion:

completely, totally:

observe:

obsess:

obsolete:

occupy:


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