To make something certain.
To give an assurance that something will be done right.
To assume or take responsibility for a debt or other obligation.
The person to whom a guarantee is made.
A person who gives such a guarantee; a guarantor.
A legal assurance of something, e.g. a security for the fulfillment of an obligation.
More specifically, a written declaration that a certain product will be fit for a purpose and work correctly; a warranty
Anything that assures a certain outcome.
To save (a shot).
To ward off (a malignant influence, attack etc.).
To drive back (an assailant, advancing force etc.).
To cause repulsion or dislike in; to disgust.
To reject, put off (a request, demand etc.).
To force away by means of a repulsive force.