1
general::
1. In the forward section, as of an airplane or theater. For example, We'd like two seats as far up front as possible. [First half of 1900s] 2. Paid in advance, as in We need at least half of the money for the production up front. [Colloquial; c. 1930] 3. Candid, direct, as in Now tell me straight up front what you think of this outfit. [Second half of 1900s]
American Heritage Idioms
2
general::
Phrase(s): up front
1. in the forefront; under fire (at the front). • You guys who are up front are gonna get the most fire. • You two go up front and see if you can help. 2. Fig. at the beginning; in advance. • She wanted $200 up front. • The more you pay up front, the less you’ll have to finance. 3. Fig. open; honest; forthcoming. • She is a very up front gal— trust her. • I wish the salesman had been more up front about it.
McGrawhill's American Idioms And Phrasal Verbs