How would you define Over-leverage?

[Andy Wilson]

Hi BP,

I realize again the importance of avoiding over-leveraging especially in this unforeseen recession crisis.

I thought I would never leverage more than I can handle (pay them all back) in the worst situation, but am realizing that this is a pretty vague principle. More importantly, it substantially prevents me from scale up enough.

How would you define over-leverage that should be avoided?