second wave
Used for a second surge or phase, especially in contexts like epidemics, trends, or social movements.
Experts warned of the arrival of a second wave.
Strengthen the medical system in preparation for a second wave of infections.
Standard kanji spelling, preferred in formal contexts.
Variant using numeral 2; common in news headlines and informal writing.
Compound of 第 (ordinal prefix) + 二 (two) + 波 (wave). A straightforward Sino-Japanese formation.