The phrase "not born yesterday" is an idiomatic expression that originated from the literal interpretation of being born, which refers to the act of coming into existence. However, when used in reference to an individual, it implies that they are experienced, knowledgeable, or shrewd, contrasting with the naivety or gullibility of someone who is recently born or new to a situation. It suggests that the person has enough life experience or intelligence to recognize deceit, manipulation, or trickery.
"On the lookout" means to be watchful, alert, or observant, often referring to a state of vigilance or awareness. When combined with "not born yesterday," it portrays an individual who is cautious and attentive, constantly watching for potential dangers, hidden motives, or suspicious activities. Such an individual is astute, perceptive, and quick to detect inconsistencies or potential threats.
Together, "not born yesterday on the lookout" characterizes someone who possesses street smarts, sharp instincts, and wisdom gained from experience. This person is not easily fooled, tricked, or taken advantage of as they have a keen eye for deception and remain vigilant in their surroundings. They are wise enough to discern genuine intentions from ulterior motives and are always on guard. It reflects a state of readiness, wariness, and astuteness that enables them to navigate through various situations with caution and awareness.
