Acobardes comes from the verb acobardarse, which means to get scared or to chicken out. It's a less common and more evocative word than simply saying "no tengas miedo" (don't be afraid).
In the song, the lyric "Aún no es tarde, así que no te acobardes" (It's not too late, so don't chicken out) is a direct plea to someone to be brave and take a chance on love. It adds a layer of urgency and emotional depth to the message.
Mau y Ricky's "Once" is a super relatable song about that feeling when you just can't get over someone, even when you try to pretend you're fine. Our singer is definitely in his feels, waking up at 11 AM because, well, what's the point of getting up early when the person you want isn't there? He can't forget a specific sunset they shared, and even though he tries to hide it, he's totally bothered by the heartache. He's literally staring at the ceiling, wishing he was with them instead.
He realizes that nothing else can fill the void this person left, even with "cincuenta" (fifty) other things. He's dropping hints, asking "Dime cómo lo digo, cacha mi indirecta" (Tell me how to say it, catch my hint), because he wants to be with them again, making out "hasta perder la cuenta" (until losing count). The lyrics are full of vivid images of their past, like "Besos de carretera, lipstick en la guantera" (Road trip kisses, lipstick in the glove compartment), showing how much he misses their connection. He even says, "Mujeres como tú, te juro, ya no hacen" (Women like you, I swear, they don't make anymore), which is a pretty strong compliment! He's ready to make peace and just fall into a pile of kisses. It's a fun, honest look at longing for a lost love and hoping for a second chance.