Reliable, dependable, and worthy of trust; something or someone that has proven faithful over time.
From 'trust' (from Old Norse 'traust,' firmness, confidence) plus the suffix '-y' (having the quality of). Dates to around the 1500s in its modern form.
'Your trusty steed' or 'my trusty rifle' is a phrase from Western novels and adventure stories—it means something you've relied on so many times you can bet your life on it. The word carries a sense of loyal companionship, which is why we use it affectionately for tools and animals.
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