Lat. Let him beware. A formal notice or warning given by a party interested to a court, judge, or ministerial officer against the performance of certain acts within his power and jurisdiction. This process may be used in the proper courts to prevent (temporarily or provisionally) the proving of a will or the grant of administration, or to arrest the enrollment of a decree in chancery when the party intends to take an appeal, to prevent the grant of letters patent, etc. It is also used, in the American practice, as a kind of equitable process, to stay the granting of a patent for lands. Wilson v.