noun
a step forward; one step forward
Used both literally and figuratively for progress or advancement, often in the context of gradual improvement or moving closer to a goal.
今回の合意は和平への一歩前進だ。
This agreement is a step forward toward peace.
彼は一歩前進して握手を求めた。
He took a step forward and offered a handshake.
Compound of 一歩 (ippo, 'one step') and 前進 (zenshin, 'advance'). The meaning is transparent from its parts.