嘏

Its parts

• 古 gǔ ancient = 十 + 口 meaning
• 叚 jiǎ to borrow (variant of 假[jia3]) sound

Other characters with 叚 as their sound:

假 jiǎ瑕 xiá霞 xiá暇 xiá婽 jiǎ葭 jiā遐 xiá瘕 jiǎ

Dictionaries file it under 口.