This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 豛 is uncertain. It combines 豕 (pig) and 殳 (a weapon or action), but the original meaning and formation are unclear.
The kanji visually contains a pig 豕 and a weapon 殳, but its meaning is unknown. Picture a pig holding a weapon, but remember that this character has no clear meaning.
For エキ, imagine a pig 豕 with a weapon 殳 making an 'eki' sound as it swings. The sound 'eki' cues エキ, even though the meaning is uncertain.