Old English sicerian

← German sickern (cognate)

← English sike (link)

← English sie (link)

← Proto-Germanic *sikrōną (inherited)

← Proto-Germanic *sīkrōną (mention)

← Proto-Germanic *sīką (cognate)

← German Low German sickern (cognate)

← Saterland Frisian sikkerje (cognate)

→ English sicker (inherited)