Syntax: break

Breaks execution of the inmost loop containing the break command, continuing execution after the loop.

foreach item $list {
    ...
    if {[someCondition]} {
        break
    }
    ...
}

# Execution continues here after the break

The break command is semantically equivalent to return -code break -level 0, as is the following procedure:

proc my_break {} {
    return -code break -level 1
}

See the return reference page for more information.