誓 means “vow, swear”

ちかう · chikau

Also: pledge

Kun'yomi (Japanese reading)
ちかう
On'yomi (Chinese reading)
セイ

JLPT N1 · Taught in secondary school · 14 strokes

The story

Words (言) under 折, to snap: picture a promise sealed by breaking an arrow in two. 誓う is to swear, 誓い is a vow, and every national high school baseball tournament opens with a captain reciting the 選手宣誓, the players' oath.

Used in 誓う (chikau, to swear/vow), 宣誓 (sensei, oath), and 誓約 (seiyaku, pledge)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.