[f. TRENCH sb. + -FUL.] As many or as much as a trench holds or will hold.
1900. Blackw. Mag., July, 125/2. The Commandant of the trenchful of Boers.
1901. Linesman, Words Eyewitness, vii. (1902), 151. Behind them again the advanced guard of a trenchful of curious private soldiers.