The phrase 'อาจจะ (àat jà)' is used in Thai language to indicate possibilities or make uncertain predictions. It is similar to English expressions 'might', 'perhaps', 'possibly'. It's often used at the beginning of a sentence before a verb to express a probability or possibility that something might occur or is perhaps true, providing a level of uncertainty to the statement. It can be used in various scenarios to discuss possible future events or outcomes.