Words That are Their Own Opposite

English is so much fun. Here are some words that are difficult to define without context.
Apology: A statement of contrition for an action, or a defense of one.
Bill: A payment, or an invoice for payment.
Bolt: To secure, or to flee.
Bound: Heading to a destination, or restrained from movement.
Buckle: To connect, or to break or collapse.
Cleave: To adhere, or to separate.
Clip: To fasten, or detach.
Consult: To offer advice, or to obtain it.
Continue: To keep doing an action, or to suspend an action.
Custom: A common practice, or a special treatment.
Dike: A wall to prevent flooding, or a ditch.
Discursive: Moving in an orderly fashion among topics, or proceeding aimlessly in a discussion.
Dollop: A large amount (British English), or a small amount.
Dust: To add fine particles, or to remove them.
First degree: Most severe in the case of a murder charge, or least severe in reference to a burn.