Keelhauling is defined as a severe nautical punishment where someone is dragged under a ship's keel. Though this punishment may have been common in historical times, it is no longer practiced today. However, this word still exists in the English language and can be replaced with less violent synonyms. For example, you could say someone was reprimanded or disciplined harshly instead of using "keelhauling". Alternatively, words like punishment, castigation, or chastisement could also replace this phrase. It's important to choose words that accurately convey meaning without promoting harmful or violent behavior.