A four-character idiom meaning alternating advances and retreats; a seesaw situation where progress and setbacks occur alternately.
病状は一進一退で、まだ予断を許さない。
The patient's condition is waxing and waning, and it's still uncertain.
交渉は一進一退を続けている。
The negotiations continue with alternating progress and setbacks.
景気は一進一退の状態だが、回復の兆しも見える。
The economy is in a seesaw state, but signs of recovery can be seen.