Ceilings, informally

• Completely uses up, as a credit card, with "out"
• Uses up all the credit on, with "out"
• Baer and Factor
• Levels off, with "out"
• Highest points, for short
• __ out (reaches a peak)
• Plateaus, with "out"
• Tops out

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: max )