Can configure the alt (option)-key behavior in your iTerm2 profile.
Left/Right Option Key Acts As
It is common to use a modifier to send so-called "meta keys". For most users, selecting "+Esc" here is the right choice. The "Meta" option sets the high bit of the input character, and is not compatible with modern systems.
Left/Right Option Key Acts As
It is common to use a modifier to send so-called "meta keys". For most users, selecting "+Esc" here is the right choice. The "Meta" option sets the high bit of the input character, and is not compatible with modern systems.
http://www.iterm2.com/#/section/documentation