The kanji 応 generally conveys the idea of "response," "answer," "support," or "application." It suggests a reaction or a matching action to something else. This can include responding to a request, offering support, or fulfilling a requirement. It implies a sense of action or behavior that is performed in reaction to a stimulus.

・On-yomi (音読み): オウ (ō) ・Kun-yomi (訓読み): こた-える (kota-eru - to answer, to respond), おう-じる (ō-jiru - to respond, to accept)

⚫︎ 応答 Translation: Response; reply ⚫︎ 応援 Translation: Support; cheering ⚫︎ 応用 Translation: Application; practical use

The kanji 応 is a 形声文字 (keisei moji - phono-semantic compound), meaning it combines a semantic (meaning) component and a phonetic (sound) component. The semantic component is 广, which represents a house or shelter. The phonetic component is 坴, which provides the sound. The original meaning might have been related to the echo that happens in a shelter, hence related to responding or answering. Over time, it developed to mean "answer," "respond," and other related concepts.