one-on-one fight / (by extension) one-on-one competition or contest

(electricity) negative charge

bath time

limeade

A transliteration of the English male given name and surname Simon

see you later (said by a person staying, a stock phrase required by the Japanese etiquette, lit.: (after) going, come back)

行っていらっしゃい: alternative form of いってらっしゃい (itterasshai)

引力: gravitation, gravity

妹分: sworn younger sister

see you later (said by a person leaving, a stock phrase required by the Japanese etiquette, lit.: (after) going, I will come back)