The Western CuebidLong ago a cue bid of the opponent's suit in a competitive auction was used to show a stopper, inviting partner to bid notrump. Today that style is referred to as an "Eastern Cuebid" as opposed to a "Western cuebid" which denies a stopper.
This is an easy way to remember the Western Cuebid:
3 by East is the Western Cuebid. 3NT would be a good contract if opener can control the heart suit. Note that opener's rebid of 4 denies both a heart stopper and also denies support for responder's suit.
These two examples show you that the Western Cuebid can be used by either the opener or the responder.
Here are some generally accepted agreements and refinements you should consider...
Western Cuebids Are Only Used at the 3-Level
In this auction the cuebid of 2 is at the 2-level and is used to show a limit raise or better in opener's hearts.
Western Cuebids Are Not Used After a Major Suit Fit Has Been Found
When the opponents have bid two suits, a cue bid is not the Western Cuebid, but instead shows a stopper in the bid suit. Partner is asked to bid 3NT with a stopper in the other suit.
After a Takeout Double
After partner makes a takeout double of a minor suit, a cuebid at the 4-level shows at least 4-4 in the majors and asks the doubler to choose the best one.
The Jump Cuebid
You will need to discuss this with your partner and reach an agreement, as there is no "standard" rule for it, but here are threee possible methods:
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