[by the piece] {adv. phr.} Counted one piece at a time, […]

[by the seat of one's pants] See: [FLY BY THE SEAT […]

[by the skin of one's teeth] {adv. phr.} By a narrow […]

[by the sweat of one's brow] {adv. phr.} By hard work; […]

[by the thousand] See: [BY THE DOZEN].

[by the way] also [by the bye] {adv. phr.} Just as […]

[by the wayside] See: [FALL BY THE WAYSIDE].

[by turns] {adv. phr.} First one and then another in a […]

[by virtue of] also [in virtue of] {prep.} On the strength […]

[by way of] {prep.} 1. For the sake or purpose of; […]