Dic: step out of line

43. PHRASE : v PHR, v-link PHR △If someone steps out of line, they disobey someone or behave in an unacceptable way.

• Any one of my players who steps out of line will be in trouble with me as well. 
• You're way out of line, lady.

......... Cobuild

step out of line: 

1. Lit. △to move out of a line of people.

• If you step out of line, you will lose your place in it. 
• I had to step out of line to sit down on the curb and rest for a minute.

2. Fig. △to misbehave; to deviate from normal, expected, or demanded behavior.

• If you step out of line again, I'll slap you. 
• Tom stepped out of line once too often and got yelled at.

........ http://idioms.thefreedictionary.com/step+out+of+line