insure

Verb

Synonyms: see check see to it ensure control ascertain assure guarantee secure cover underwrite

WordNet 3.0

Verb (4)

be careful or certain to do something; make certain of something“He verified that the valves were closed”“See that the curtains are closed”“control the quality of the product”Synonyms: see check see to it ensure control ascertain assure
make certain of“This nest egg will ensure a nice retirement for us”“Preparation will guarantee success!”Synonyms: guarantee ensure assure secure
protect by insurance“The insurance won't cover this”Synonyms: cover underwrite
take out insurance for

Webster's Dictionary (GCIDE)

Insure \In*sure"\, v. i. To underwrite; to make insurance; as, a company insures at three per cent. [1913 Webster]

Insure \In"sure\, v. t. [imp. & p. p. Insured; p. pr. & vb. n. Insuring.] [OE. ensuren, prob. for assuren, by a change of prefix. See 1st In-, and Sure, and cf. Assure, Ensure.] [Written also ensure.] [1913 Webster]

1.To make sure or secure; as, to insure safety to any one. [1913 Webster]

2.Specifically, to secure against a loss by a contingent event, on certain stipulated conditions, or at a given rate or premium; to give or to take an insurance on or for; as, a merchant insures his ship or its cargo, or both, against the dangers of the sea; goods and buildings are insured against fire or water; persons are insured against sickness, accident, or death; and sometimes hazardous debts are insured. [1913 Webster]