Verified Answer

Some takeover defenses by the target company are-

Changing bylaws of the target company so that directors have staggered terms and not all directors can be elected at one time. This will prevent a hostile raider from purchasing a minority stake in the target company and elect its ally to the board.
Changing bylaws of the target company so that the merger is authorized only by a supermajority(75% or more) and not the simple majority.
Raising antitrust issues so that the Justice Department blocks the merger.
Defensive merger where the target company asks another company to acquire them. In this case, the acquiring company has a more friendly CEO and the board as compared to the raider.