• 喫茶きっさ — tea/coffee (drinks) service; a café
• 喫煙きつえん — smoking
• 満喫まんきつ — to fully enjoy; to have one’s fill
• 喫水きっすい — draft of a ship (waterline depth)
• 喫きっする — to receive / undergo / suffer (formal)

With the mouth radical 口 on the left, 喫 centers on what enters the mouth — drinking or inhaling. The right side gives the sound. From “to drink” it extends to “to smoke” and even “to receive/undergo,” as in 満喫 “to have one’s fill.”