To bind or obligate (oneself, for example) beyond the capacity for realization.
To allocate or apportion (money, goods, or resources) in amounts incapable of replacement.
To be or become overcommitted.
To commit (oneself or others) to too many obligations, too full a schedule, etc.
To promise (something) in a quantity above that which can be provided.
Don't overcommit yourself this month.
(computing) Allocation of more resources than are actually available.
Origin of overcommit
over- +"Ž commit