The Collaborative International Dictionary of English v.0.48:
Sublet \Sub*let"\, v. t. [imp. & p. p. Sublet; p. pr. & vb. n. Subletting.] To underlet; to lease, as when a lessee leases to another person. [1913 Webster]WordNet (r) 3.0 (2006):
sublet n 1: a lease from one lessee to another [syn: sublease, sublet] v 1: lease or rent all or part of (a leased or rented property) to another person; "We sublet our apartment over the summer" [syn: sublet, sublease]